<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    button.active{
      background-color:red;
    }
    .content{
      width: 200px;
      height: 200px;
      border: 1px solid #333;
      text-align: center;
      line-height: 200px;
      font-size: 50px;
    }
  </style>
</head>
<body>
  <div id="app">
    <button
       @click="switchTab(index)" 
       v-for="(tab,index) in tabs"
       :class="{active: num===index}">{{tab.title}}</button>
    
    <div 
      class="content" 
      v-for="(tab,index) in tabs"
      v-show="num===index">
      {{ tab.content }}
    </div>
   
  </div>
  <script src="./vue.js"></script>
  <script>
    const vm = new Vue({
      el: '#app',
      data: {
        num: 0,
        tabs: [
          {
            title:'标题1',
            content: '内容1'
          },
          {
            title:'标题2',
            content: '内容2'
          },
          {
            title:'标题3',
            content: '内容3'
          },
          {
            title:'标题4',
            content: '内容4'
          }
        ]
      },
      methods: {
        switchTab(n){
          this.num = n
        }
      }
    })
  </script>
</body>
</html>